Skeletal dysplasias are disorders characterized by developmental abnormalities of the bone and cartilage. They are usually associated with disproportionate short stature and this large heterogenous group can range in severity from early osteoarthritis to perinethal lethality. The goal of orthopedic surgeon caring for a person with skeletal dysplasia should be to preserve or improve function and prevention of future limitations. Traditional evaluation tools for the lower extremity malalignments in patients with skeletal dysplasia are weight-bearing orthoroentgenograms for the coronal and sagittal plan deformities and CT for the torsional deformities. Dynamic evaluation of gait with 3D gait analysis seems to be promising improvement in the treatment and follow-up of bone deformities in skeletal dysplasia patients by giving accurate information about each plan deformities under loading.